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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <title>Document</title>
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<body>
    <script type="text/javascript">
        // 求5的阶乘
     function fn(n) {
         const result=[]
if(n===1){
    return 1
}else{
    const ret=n*fn(n-1)
    return ret
}

         return result
     }
     const res=fn(5)
     console.log(res);
    </script>
</body>
</html>